MIMO Retransmission Control with Unique Stream Block Identification
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Solution Overview
Problem
In MIMO transmission systems, when the transmission mode changes from MIMO multiplex to MIMO diversity, the receiver cannot accurately recognize which retained process to synthesize, leading to re-sending errors and communication disruptions due to overlapping process numbers and incorrect ACK/NACK signal handling.
Innovation Solution
A transmission controlling method that includes annexing non-competitive data block identification information to each data block, allowing the receiver to correctly synthesize re-sent and received data blocks, and monitoring wireless quality to adjust the number of streams, ensuring seamless communication by avoiding re-sending errors and maintaining stream identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If process numbers are used for stream identification in MIMO transmission, then stream identification is achieved, but process number overlap occurs when transmission mode changes causing re-sending errors
Solution Approach 1:
The patent introduces a new dimension to the identification system by combining process numbers with antenna identifiers. Instead of relying solely on process numbers (one-dimensional identification), the system creates a two-dimensional identification space where each data block is uniquely identified by the pair (antenna identifier, process number). This dimensional expansion eliminates identification conflicts when transmission modes change, as the same process number can be reused across different antennas without causing ambiguity.
Solution Approach 2:
The patent creates a composite identification mechanism by merging two distinct identification elements: antenna identifiers and process numbers. This composite identification system functions similarly to how composite materials combine different properties to achieve superior performance. The combination ensures that even if process numbers overlap, the full identification (antenna identifier + process number) remains unique, preventing re-sending errors while maintaining stream identification accuracy.
2Productivity
If the number of transmission streams is increased to improve data rate, then transmission capacity increases, but system complexity and difficulty of stream management increase
Solution Approach 1:
The patent applies segmentation by dividing the stream management function into two independent parts: antenna-level identification (using antenna identifiers) and process-level identification (using process numbers). This segmentation allows the system to handle multiple streams by independently managing antenna resources and process resources, rather than managing all streams as a single complex entity. The segmentation reduces management complexity while preserving the ability to transmit multiple data streams simultaneously.
3Reliability
If mode change timing is delayed to complete data transmission, then data loss is prevented, but communication latency increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring the identification system with antenna identifiers before mode changes occur. This preliminary setup ensures that when mode changes happen, the identification system is already prepared to handle the transition without requiring delays for reconfiguration or mode completion. The receiver can immediately process incoming data blocks with the new identification scheme, reducing latency while maintaining data transmission completeness.
Data Source
AI summary
In a wireless communication system, a sender apparatus sends a data block, for each of a plurality of stream data, with data block identification information, which does not conflict between stream data, annexed, and a reception apparatus performs a re-sending synthesis process for a data block received already and a re-sending data block to which the same data block identification information is individually annexed based on the data block identification information annexed to the received data block. Consequently, also in a case wherein the number of transmission streams between the sender apparatus and the reception apparatus is varied (reduced), the matching property of the data block which is a re-sending synthesis target can be maintained and communication can be continued normally.